... .quick delivery 4.low price middle size steel L-shape drive board weldment manufacturerproduct namedimension(mm)standardprocessing craftdrive board ... cast iron ,ductile iron,carbon steel ,alloy steel, ordinary steel ,aluminum ,brass and its alloy materials, plastic.processing trade form drawings ... (86-510)86521310 Fax( 86-510)86529579 middle size alloy steel L-shape drive board weldment manufacturer